<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
    <title>The File object &mdash; Django 1.7.8.dev20150401230226 documentation</title>
    
    <link rel="stylesheet" href="../../_static/default.css" type="text/css" />
    <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript">
      var DOCUMENTATION_OPTIONS = {
        URL_ROOT:    '../../',
        VERSION:     '1.7.8.dev20150401230226',
        COLLAPSE_INDEX: false,
        FILE_SUFFIX: '.html',
        HAS_SOURCE:  true
      };
    </script>
    <script type="text/javascript" src="../../_static/jquery.js"></script>
    <script type="text/javascript" src="../../_static/underscore.js"></script>
    <script type="text/javascript" src="../../_static/doctools.js"></script>
    <link rel="top" title="Django 1.7.8.dev20150401230226 documentation" href="../../index.html" />
    <link rel="up" title="File handling" href="index.html" />
    <link rel="next" title="File storage API" href="storage.html" />
    <link rel="prev" title="File handling" href="index.html" />



 
<script type="text/javascript" src="../../templatebuiltins.js"></script>
<script type="text/javascript">
(function($) {
    if (!django_template_builtins) {
       // templatebuiltins.js missing, do nothing.
       return;
    }
    $(document).ready(function() {
        // Hyperlink Django template tags and filters
        var base = "../templates/builtins.html";
        if (base == "#") {
            // Special case for builtins.html itself
            base = "";
        }
        // Tags are keywords, class '.k'
        $("div.highlight\\-html\\+django span.k").each(function(i, elem) {
             var tagname = $(elem).text();
             if ($.inArray(tagname, django_template_builtins.ttags) != -1) {
                 var fragment = tagname.replace(/_/, '-');
                 $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>");
             }
        });
        // Filters are functions, class '.nf'
        $("div.highlight\\-html\\+django span.nf").each(function(i, elem) {
             var filtername = $(elem).text();
             if ($.inArray(filtername, django_template_builtins.tfilters) != -1) {
                 var fragment = filtername.replace(/_/, '-');
                 $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>");
             }
        });
    });
})(jQuery);
</script>


  </head>
  <body>

    <div class="document">
  <div id="custom-doc" class="yui-t6">
    <div id="hd">
      <h1><a href="../../index.html">Django 1.7.8.dev20150401230226 documentation</a></h1>
      <div id="global-nav">
        <a title="Home page" href="../../index.html">Home</a>  |
        <a title="Table of contents" href="../../contents.html">Table of contents</a>  |
        <a title="Global index" href="../../genindex.html">Index</a>  |
        <a title="Module index" href="../../py-modindex.html">Modules</a>
      </div>
      <div class="nav">
    &laquo; <a href="index.html" title="File handling">previous</a>
     |
    <a href="../index.html" title="API Reference" accesskey="U">up</a>
   |
    <a href="storage.html" title="File storage API">next</a> &raquo;</div>
    </div>

    <div id="bd">
      <div id="yui-main">
        <div class="yui-b">
          <div class="yui-g" id="ref-files-file">
            
  <div class="section" id="s-the-file-object">
<span id="the-file-object"></span><h1>The <tt class="docutils literal"><span class="pre">File</span></tt> object<a class="headerlink" href="#the-file-object" title="Permalink to this headline">¶</a></h1>
<p>The <a class="reference internal" href="index.html#module-django.core.files" title="django.core.files: File handling and storage"><tt class="xref py py-mod docutils literal"><span class="pre">django.core.files</span></tt></a> module and its submodules contain built-in classes
for basic file handling in Django.</p>
<div class="section" id="s-the-file-class">
<span id="the-file-class"></span><h2>The <tt class="docutils literal"><span class="pre">File</span></tt> Class<a class="headerlink" href="#the-file-class" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="django.core.files.File">
<em class="property">class </em><tt class="descname">File</tt>(<em>file_object</em>)<a class="headerlink" href="#django.core.files.File" title="Permalink to this definition">¶</a></dt>
<dd><p>The <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a> class is a thin wrapper around a Python
<a class="reference external" href="http://docs.python.org/3/glossary.html#term-file-object" title="(in Python v3.4)"><em class="xref std std-term">file object</em></a> with some Django-specific additions.
Internally, Django uses this class when it needs to represent a file.</p>
<p><a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a> objects have the following attributes and methods:</p>
<dl class="attribute">
<dt id="django.core.files.File.name">
<tt class="descname">name</tt><a class="headerlink" href="#django.core.files.File.name" title="Permalink to this definition">¶</a></dt>
<dd><p>The name of the file including the relative path from
<a class="reference internal" href="../settings.html#std:setting-MEDIA_ROOT"><tt class="xref std std-setting docutils literal"><span class="pre">MEDIA_ROOT</span></tt></a>.</p>
</dd></dl>

<dl class="attribute">
<dt id="django.core.files.File.size">
<tt class="descname">size</tt><a class="headerlink" href="#django.core.files.File.size" title="Permalink to this definition">¶</a></dt>
<dd><p>The size of the file in bytes.</p>
</dd></dl>

<dl class="attribute">
<dt id="django.core.files.File.file">
<tt class="descname">file</tt><a class="headerlink" href="#django.core.files.File.file" title="Permalink to this definition">¶</a></dt>
<dd><p>The underlying <a class="reference external" href="http://docs.python.org/3/glossary.html#term-file-object" title="(in Python v3.4)"><em class="xref std std-term">file object</em></a> that this class wraps.</p>
</dd></dl>

<dl class="attribute">
<dt id="django.core.files.File.mode">
<tt class="descname">mode</tt><a class="headerlink" href="#django.core.files.File.mode" title="Permalink to this definition">¶</a></dt>
<dd><p>The read/write mode for the file.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.open">
<tt class="descname">open</tt>(<span class="optional">[</span><em>mode=None</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.open" title="Permalink to this definition">¶</a></dt>
<dd><p>Open or reopen the file (which also does <tt class="docutils literal"><span class="pre">File.seek(0)</span></tt>).
The <tt class="docutils literal"><span class="pre">mode</span></tt> argument allows the same values
as Python&#8217;s built-in <a class="reference external" href="http://docs.python.org/3/library/functions.html#open" title="(in Python v3.4)"><tt class="docutils literal"><span class="pre">open()</span></tt></a>.</p>
<p>When reopening a file, <tt class="docutils literal"><span class="pre">mode</span></tt> will override whatever mode the file
was originally opened with; <tt class="docutils literal"><span class="pre">None</span></tt> means to reopen with the original
mode.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.read">
<tt class="descname">read</tt>(<span class="optional">[</span><em>num_bytes=None</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.read" title="Permalink to this definition">¶</a></dt>
<dd><p>Read content from the file. The optional <tt class="docutils literal"><span class="pre">size</span></tt> is the number of
bytes to read; if not specified, the file will be read to the end.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.__iter__">
<tt class="descname">__iter__</tt>()<a class="headerlink" href="#django.core.files.File.__iter__" title="Permalink to this definition">¶</a></dt>
<dd><p>Iterate over the file yielding one line at a time.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.chunks">
<tt class="descname">chunks</tt>(<span class="optional">[</span><em>chunk_size=None</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.chunks" title="Permalink to this definition">¶</a></dt>
<dd><p>Iterate over the file yielding &#8220;chunks&#8221; of a given size. <tt class="docutils literal"><span class="pre">chunk_size</span></tt>
defaults to 64 KB.</p>
<p>This is especially useful with very large files since it allows them to
be streamed off disk and avoids storing the whole file in memory.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.multiple_chunks">
<tt class="descname">multiple_chunks</tt>(<span class="optional">[</span><em>chunk_size=None</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.multiple_chunks" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns <tt class="docutils literal"><span class="pre">True</span></tt> if the file is large enough to require multiple chunks
to access all of its content give some <tt class="docutils literal"><span class="pre">chunk_size</span></tt>.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.write">
<tt class="descname">write</tt>(<span class="optional">[</span><em>content</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.write" title="Permalink to this definition">¶</a></dt>
<dd><p>Writes the specified content string to the file. Depending on the
storage system behind the scenes, this content might not be fully
committed until <a class="reference internal" href="#django.core.files.File.close" title="django.core.files.File.close"><tt class="xref py py-func docutils literal"><span class="pre">close()</span></tt></a> is called on the file.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.close">
<tt class="descname">close</tt>()<a class="headerlink" href="#django.core.files.File.close" title="Permalink to this definition">¶</a></dt>
<dd><p>Close the file.</p>
</dd></dl>

<p>In addition to the listed methods, <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a> exposes
the following attributes and methods of its <tt class="docutils literal"><span class="pre">file</span></tt> object:
<tt class="docutils literal"><span class="pre">encoding</span></tt>, <tt class="docutils literal"><span class="pre">fileno</span></tt>, <tt class="docutils literal"><span class="pre">flush</span></tt>, <tt class="docutils literal"><span class="pre">isatty</span></tt>, <tt class="docutils literal"><span class="pre">newlines</span></tt>,
<tt class="docutils literal"><span class="pre">read</span></tt>, <tt class="docutils literal"><span class="pre">readinto</span></tt>, <tt class="docutils literal"><span class="pre">readlines</span></tt>, <tt class="docutils literal"><span class="pre">seek</span></tt>, <tt class="docutils literal"><span class="pre">softspace</span></tt>, <tt class="docutils literal"><span class="pre">tell</span></tt>,
<tt class="docutils literal"><span class="pre">truncate</span></tt>, <tt class="docutils literal"><span class="pre">writelines</span></tt>, <tt class="docutils literal"><span class="pre">xreadlines</span></tt>.</p>
</dd></dl>

</div>
<div class="section" id="s-the-contentfile-class">
<span id="the-contentfile-class"></span><h2>The <tt class="docutils literal"><span class="pre">ContentFile</span></tt> Class<a class="headerlink" href="#the-contentfile-class" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="django.core.files.base.ContentFile">
<em class="property">class </em><tt class="descname">ContentFile</tt>(<em>File</em>)<a class="reference internal" href="../../_modules/django/core/files/base.html#ContentFile"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.files.base.ContentFile" title="Permalink to this definition">¶</a></dt>
<dd><p>The <tt class="docutils literal"><span class="pre">ContentFile</span></tt> class inherits from <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a>,
but unlike <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a> it operates on string content
(bytes also supported), rather than an actual file. For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">unicode_literals</span>
<span class="kn">from</span> <span class="nn">django.core.files.base</span> <span class="kn">import</span> <span class="n">ContentFile</span>

<span class="n">f1</span> <span class="o">=</span> <span class="n">ContentFile</span><span class="p">(</span><span class="s">&quot;esta sentencia está en español&quot;</span><span class="p">)</span>
<span class="n">f2</span> <span class="o">=</span> <span class="n">ContentFile</span><span class="p">(</span><span class="n">b</span><span class="s">&quot;these are bytes&quot;</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>

</div>
<div class="section" id="s-the-imagefile-class">
<span id="the-imagefile-class"></span><h2>The <tt class="docutils literal"><span class="pre">ImageFile</span></tt> Class<a class="headerlink" href="#the-imagefile-class" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="django.core.files.images.ImageFile">
<em class="property">class </em><tt class="descname">ImageFile</tt>(<em>file_object</em>)<a class="reference internal" href="../../_modules/django/core/files/images.html#ImageFile"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.files.images.ImageFile" title="Permalink to this definition">¶</a></dt>
<dd><p>Django provides a built-in class specifically for images.
<a class="reference internal" href="#django.core.files.images.ImageFile" title="django.core.files.images.ImageFile"><tt class="xref py py-class docutils literal"><span class="pre">django.core.files.images.ImageFile</span></tt></a> inherits all the attributes
and methods of <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a>, and additionally
provides the following:</p>
<dl class="attribute">
<dt id="django.core.files.images.ImageFile.width">
<tt class="descname">width</tt><a class="headerlink" href="#django.core.files.images.ImageFile.width" title="Permalink to this definition">¶</a></dt>
<dd><p>Width of the image in pixels.</p>
</dd></dl>

<dl class="attribute">
<dt id="django.core.files.images.ImageFile.height">
<tt class="descname">height</tt><a class="headerlink" href="#django.core.files.images.ImageFile.height" title="Permalink to this definition">¶</a></dt>
<dd><p>Height of the image in pixels.</p>
</dd></dl>

</dd></dl>

</div>
<div class="section" id="s-additional-methods-on-files-attached-to-objects">
<span id="additional-methods-on-files-attached-to-objects"></span><h2>Additional methods on files attached to objects<a class="headerlink" href="#additional-methods-on-files-attached-to-objects" title="Permalink to this headline">¶</a></h2>
<p>Any <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a> that is associated with an object (as with <tt class="docutils literal"><span class="pre">Car.photo</span></tt>,
below) will also have a couple of extra methods:</p>
<dl class="method">
<dt id="django.core.files.File.save">
<tt class="descclassname">File.</tt><tt class="descname">save</tt>(<em>name</em>, <em>content</em><span class="optional">[</span>, <em>save=True</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.save" title="Permalink to this definition">¶</a></dt>
<dd><p>Saves a new file with the file name and contents provided. This will not
replace the existing file, but will create a new file and update the object
to point to it. If <tt class="docutils literal"><span class="pre">save</span></tt> is <tt class="docutils literal"><span class="pre">True</span></tt>, the model&#8217;s <tt class="docutils literal"><span class="pre">save()</span></tt> method will
be called once the file is saved. That is, these two lines:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">car</span><span class="o">.</span><span class="n">photo</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s">&#39;myphoto.jpg&#39;</span><span class="p">,</span> <span class="n">content</span><span class="p">,</span> <span class="n">save</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">car</span><span class="o">.</span><span class="n">save</span><span class="p">()</span>
</pre></div>
</div>
<p>are equivalent to:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">car</span><span class="o">.</span><span class="n">photo</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s">&#39;myphoto.jpg&#39;</span><span class="p">,</span> <span class="n">content</span><span class="p">,</span> <span class="n">save</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
</pre></div>
</div>
<p>Note that the <tt class="docutils literal"><span class="pre">content</span></tt> argument must be an instance of either
<a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a> or of a subclass of <a class="reference internal" href="#django.core.files.File" title="django.core.files.File"><tt class="xref py py-class docutils literal"><span class="pre">File</span></tt></a>, such as
<a class="reference internal" href="#django.core.files.base.ContentFile" title="django.core.files.base.ContentFile"><tt class="xref py py-class docutils literal"><span class="pre">ContentFile</span></tt></a>.</p>
</dd></dl>

<dl class="method">
<dt id="django.core.files.File.delete">
<tt class="descclassname">File.</tt><tt class="descname">delete</tt>(<span class="optional">[</span><em>save=True</em><span class="optional">]</span>)<a class="headerlink" href="#django.core.files.File.delete" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes the file from the model instance and deletes the underlying file.
If <tt class="docutils literal"><span class="pre">save</span></tt> is <tt class="docutils literal"><span class="pre">True</span></tt>, the model&#8217;s <tt class="docutils literal"><span class="pre">save()</span></tt> method will be called once
the file is deleted.</p>
</dd></dl>

</div>
</div>


          </div>
        </div>
      </div>
      
        
          <div class="yui-b" id="sidebar">
            
      <div class="sphinxsidebar">
        <div class="sphinxsidebarwrapper">
  <h3><a href="../../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">The <tt class="docutils literal"><span class="pre">File</span></tt> object</a><ul>
<li><a class="reference internal" href="#the-file-class">The <tt class="docutils literal"><span class="pre">File</span></tt> Class</a></li>
<li><a class="reference internal" href="#the-contentfile-class">The <tt class="docutils literal"><span class="pre">ContentFile</span></tt> Class</a></li>
<li><a class="reference internal" href="#the-imagefile-class">The <tt class="docutils literal"><span class="pre">ImageFile</span></tt> Class</a></li>
<li><a class="reference internal" href="#additional-methods-on-files-attached-to-objects">Additional methods on files attached to objects</a></li>
</ul>
</li>
</ul>

  <h3>Browse</h3>
  <ul>
    
      <li>Prev: <a href="index.html">File handling</a></li>
    
    
      <li>Next: <a href="storage.html">File storage API</a></li>
    
  </ul>
  <h3>You are here:</h3>
  <ul>
      <li>
        <a href="../../index.html">Django 1.7.8.dev20150401230226 documentation</a>
        
          <ul><li><a href="../index.html">API Reference</a>
        
          <ul><li><a href="index.html">File handling</a>
        
        <ul><li>The <tt class="docutils literal"><span class="pre">File</span></tt> object</li></ul>
        </li></ul></li></ul>
      </li>
  </ul>

  <h3>This Page</h3>
  <ul class="this-page-menu">
    <li><a href="../../_sources/ref/files/file.txt"
           rel="nofollow">Show Source</a></li>
  </ul>
<div id="searchbox" style="display: none">
  <h3>Quick search</h3>
    <form class="search" action="../../search.html" method="get">
      <input type="text" name="q" />
      <input type="submit" value="Go" />
      <input type="hidden" name="check_keywords" value="yes" />
      <input type="hidden" name="area" value="default" />
    </form>
    <p class="searchtip" style="font-size: 90%">
    Enter search terms or a module, class or function name.
    </p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
        </div>
      </div>
              <h3>Last update:</h3>
              <p class="topless">Apr 02, 2015</p>
          </div>
        
      
    </div>

    <div id="ft">
      <div class="nav">
    &laquo; <a href="index.html" title="File handling">previous</a>
     |
    <a href="../index.html" title="API Reference" accesskey="U">up</a>
   |
    <a href="storage.html" title="File storage API">next</a> &raquo;</div>
    </div>
  </div>

      <div class="clearer"></div>
    </div>
  </body>
</html>